If had read this thread I when it first was posted I might have got a reamer. I had an 18 and a 17, both with tight chambers. I did have several .22 mops and a block of jewelers rouge. I polished the chambers on both and then shot them. I kept this up until I did not have a problem with cases sticking in the chambers. I went slow to make sure I did not take off to much metal. Both revolvers shot great, trade the 18 for a Colt M1909 in .45 Colt (a great trade in my estimation) and still have the 17-2 (it will get passed down when I depart the pattern).

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USMC 69-93 Combat Pistol Inst.